References for Charles 3rd Duke, 5th Earl Spencer * of Marlborough * of Sunderland

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Sir B.Burke: A Genealogical History of the Peerages and Knightages of the British Empire. London, 1953
F. Freytag v.Loringhoven: Europäische Stammtafeln, Band III, Tafel 158. Marburg, 1956 (1964)
Gothaischer genealogischer Hofkalender auf das Jahr 1926. J.Perthes, Gotha, 1925
M.A.H., Marquis de Ruvigny: The Plantagenet roll of the blood royal, Essex Volume. London, Edinburgh, 1908